HP 3PAR Adaptive Flash Cache Configuration

Assumptions:

HP 3PAR Adaptive Flash Cache is a feature that uses SSDs for read cache. It can be used to maximize read hits and improve random read performance.

Flash Cache can be created in 16 GB increments.

Flash Cache is always created as fully allocated RAID 1 Logical Disks behind all nodes on the array

Feature can be enabled on entire system rather or on VVSet Mode.

We will activate on entire system:

Verify available space:

DC13PAR cli% showspace -p -devtype SSD -t r1 -ha mag

--Estimated(MB)---

RawFree              UsableFree

1896448                948224

Verify if Flash Cache is already configured:

DC13PAR cli% showflashcache

If is enabled you will see an output similar to:

                               -(MB)-

Node Mode  State     Size Used%

   0 SSD   normal   65536    41

   1 SSD   normal   65536    41

   2 SSD   normal   65536    45

   3 SSD   normal   65536    41

-------------------------------

   4 total         262144

And you should skip the createflashcache step.

If it`s not configured carry on with the next step:

Create 128 GB (or as much as you need) of Flash Cache for each node pair in the array:

DC13PAR cli% createflashcache 128g

Verify again with showflashcache and go to next step.

We will now enable Flash Cache on entire system, as stated at the beginning using following command:

DC13PAR cli% setflashcache enable sys:all